1 /* 2 * RISC-V CPU helpers for qemu. 3 * 4 * Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu 5 * Copyright (c) 2017-2018 SiFive, Inc. 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms and conditions of the GNU General Public License, 9 * version 2 or later, as published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14 * more details. 15 * 16 * You should have received a copy of the GNU General Public License along with 17 * this program. If not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #include "qemu/osdep.h" 21 #include "qemu/log.h" 22 #include "qemu/main-loop.h" 23 #include "cpu.h" 24 #include "pmu.h" 25 #include "exec/exec-all.h" 26 #include "instmap.h" 27 #include "tcg/tcg-op.h" 28 #include "trace.h" 29 #include "semihosting/common-semi.h" 30 #include "sysemu/cpu-timers.h" 31 #include "cpu_bits.h" 32 #include "debug.h" 33 34 int riscv_cpu_mmu_index(CPURISCVState *env, bool ifetch) 35 { 36 #ifdef CONFIG_USER_ONLY 37 return 0; 38 #else 39 return env->priv; 40 #endif 41 } 42 43 void cpu_get_tb_cpu_state(CPURISCVState *env, target_ulong *pc, 44 target_ulong *cs_base, uint32_t *pflags) 45 { 46 CPUState *cs = env_cpu(env); 47 RISCVCPU *cpu = RISCV_CPU(cs); 48 49 uint32_t flags = 0; 50 51 *pc = env->xl == MXL_RV32 ? env->pc & UINT32_MAX : env->pc; 52 *cs_base = 0; 53 54 if (cpu->cfg.ext_zve32f) { 55 /* 56 * If env->vl equals to VLMAX, we can use generic vector operation 57 * expanders (GVEC) to accerlate the vector operations. 58 * However, as LMUL could be a fractional number. The maximum 59 * vector size can be operated might be less than 8 bytes, 60 * which is not supported by GVEC. So we set vl_eq_vlmax flag to true 61 * only when maxsz >= 8 bytes. 62 */ 63 uint32_t vlmax = vext_get_vlmax(cpu, env->vtype); 64 uint32_t sew = FIELD_EX64(env->vtype, VTYPE, VSEW); 65 uint32_t maxsz = vlmax << sew; 66 bool vl_eq_vlmax = (env->vstart == 0) && (vlmax == env->vl) && 67 (maxsz >= 8); 68 flags = FIELD_DP32(flags, TB_FLAGS, VILL, env->vill); 69 flags = FIELD_DP32(flags, TB_FLAGS, SEW, sew); 70 flags = FIELD_DP32(flags, TB_FLAGS, LMUL, 71 FIELD_EX64(env->vtype, VTYPE, VLMUL)); 72 flags = FIELD_DP32(flags, TB_FLAGS, VL_EQ_VLMAX, vl_eq_vlmax); 73 flags = FIELD_DP32(flags, TB_FLAGS, VTA, 74 FIELD_EX64(env->vtype, VTYPE, VTA)); 75 flags = FIELD_DP32(flags, TB_FLAGS, VMA, 76 FIELD_EX64(env->vtype, VTYPE, VMA)); 77 } else { 78 flags = FIELD_DP32(flags, TB_FLAGS, VILL, 1); 79 } 80 81 #ifdef CONFIG_USER_ONLY 82 flags |= TB_FLAGS_MSTATUS_FS; 83 flags |= TB_FLAGS_MSTATUS_VS; 84 #else 85 flags |= cpu_mmu_index(env, 0); 86 if (riscv_cpu_fp_enabled(env)) { 87 flags |= env->mstatus & MSTATUS_FS; 88 } 89 90 if (riscv_cpu_vector_enabled(env)) { 91 flags |= env->mstatus & MSTATUS_VS; 92 } 93 94 if (riscv_has_ext(env, RVH)) { 95 if (env->priv == PRV_M || 96 (env->priv == PRV_S && !riscv_cpu_virt_enabled(env)) || 97 (env->priv == PRV_U && !riscv_cpu_virt_enabled(env) && 98 get_field(env->hstatus, HSTATUS_HU))) { 99 flags = FIELD_DP32(flags, TB_FLAGS, HLSX, 1); 100 } 101 102 flags = FIELD_DP32(flags, TB_FLAGS, MSTATUS_HS_FS, 103 get_field(env->mstatus_hs, MSTATUS_FS)); 104 105 flags = FIELD_DP32(flags, TB_FLAGS, MSTATUS_HS_VS, 106 get_field(env->mstatus_hs, MSTATUS_VS)); 107 } 108 if (cpu->cfg.debug && !icount_enabled()) { 109 flags = FIELD_DP32(flags, TB_FLAGS, ITRIGGER, env->itrigger_enabled); 110 } 111 #endif 112 113 flags = FIELD_DP32(flags, TB_FLAGS, XL, env->xl); 114 if (env->cur_pmmask < (env->xl == MXL_RV32 ? UINT32_MAX : UINT64_MAX)) { 115 flags = FIELD_DP32(flags, TB_FLAGS, PM_MASK_ENABLED, 1); 116 } 117 if (env->cur_pmbase != 0) { 118 flags = FIELD_DP32(flags, TB_FLAGS, PM_BASE_ENABLED, 1); 119 } 120 121 *pflags = flags; 122 } 123 124 void riscv_cpu_update_mask(CPURISCVState *env) 125 { 126 target_ulong mask = -1, base = 0; 127 /* 128 * TODO: Current RVJ spec does not specify 129 * how the extension interacts with XLEN. 130 */ 131 #ifndef CONFIG_USER_ONLY 132 if (riscv_has_ext(env, RVJ)) { 133 switch (env->priv) { 134 case PRV_M: 135 if (env->mmte & M_PM_ENABLE) { 136 mask = env->mpmmask; 137 base = env->mpmbase; 138 } 139 break; 140 case PRV_S: 141 if (env->mmte & S_PM_ENABLE) { 142 mask = env->spmmask; 143 base = env->spmbase; 144 } 145 break; 146 case PRV_U: 147 if (env->mmte & U_PM_ENABLE) { 148 mask = env->upmmask; 149 base = env->upmbase; 150 } 151 break; 152 default: 153 g_assert_not_reached(); 154 } 155 } 156 #endif 157 if (env->xl == MXL_RV32) { 158 env->cur_pmmask = mask & UINT32_MAX; 159 env->cur_pmbase = base & UINT32_MAX; 160 } else { 161 env->cur_pmmask = mask; 162 env->cur_pmbase = base; 163 } 164 } 165 166 #ifndef CONFIG_USER_ONLY 167 168 /* 169 * The HS-mode is allowed to configure priority only for the 170 * following VS-mode local interrupts: 171 * 172 * 0 (Reserved interrupt, reads as zero) 173 * 1 Supervisor software interrupt 174 * 4 (Reserved interrupt, reads as zero) 175 * 5 Supervisor timer interrupt 176 * 8 (Reserved interrupt, reads as zero) 177 * 13 (Reserved interrupt) 178 * 14 " 179 * 15 " 180 * 16 " 181 * 17 " 182 * 18 " 183 * 19 " 184 * 20 " 185 * 21 " 186 * 22 " 187 * 23 " 188 */ 189 190 static const int hviprio_index2irq[] = { 191 0, 1, 4, 5, 8, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23 }; 192 static const int hviprio_index2rdzero[] = { 193 1, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; 194 195 int riscv_cpu_hviprio_index2irq(int index, int *out_irq, int *out_rdzero) 196 { 197 if (index < 0 || ARRAY_SIZE(hviprio_index2irq) <= index) { 198 return -EINVAL; 199 } 200 201 if (out_irq) { 202 *out_irq = hviprio_index2irq[index]; 203 } 204 205 if (out_rdzero) { 206 *out_rdzero = hviprio_index2rdzero[index]; 207 } 208 209 return 0; 210 } 211 212 /* 213 * Default priorities of local interrupts are defined in the 214 * RISC-V Advanced Interrupt Architecture specification. 215 * 216 * ---------------------------------------------------------------- 217 * Default | 218 * Priority | Major Interrupt Numbers 219 * ---------------------------------------------------------------- 220 * Highest | 47, 23, 46, 45, 22, 44, 221 * | 43, 21, 42, 41, 20, 40 222 * | 223 * | 11 (0b), 3 (03), 7 (07) 224 * | 9 (09), 1 (01), 5 (05) 225 * | 12 (0c) 226 * | 10 (0a), 2 (02), 6 (06) 227 * | 228 * | 39, 19, 38, 37, 18, 36, 229 * Lowest | 35, 17, 34, 33, 16, 32 230 * ---------------------------------------------------------------- 231 */ 232 static const uint8_t default_iprio[64] = { 233 /* Custom interrupts 48 to 63 */ 234 [63] = IPRIO_MMAXIPRIO, 235 [62] = IPRIO_MMAXIPRIO, 236 [61] = IPRIO_MMAXIPRIO, 237 [60] = IPRIO_MMAXIPRIO, 238 [59] = IPRIO_MMAXIPRIO, 239 [58] = IPRIO_MMAXIPRIO, 240 [57] = IPRIO_MMAXIPRIO, 241 [56] = IPRIO_MMAXIPRIO, 242 [55] = IPRIO_MMAXIPRIO, 243 [54] = IPRIO_MMAXIPRIO, 244 [53] = IPRIO_MMAXIPRIO, 245 [52] = IPRIO_MMAXIPRIO, 246 [51] = IPRIO_MMAXIPRIO, 247 [50] = IPRIO_MMAXIPRIO, 248 [49] = IPRIO_MMAXIPRIO, 249 [48] = IPRIO_MMAXIPRIO, 250 251 /* Custom interrupts 24 to 31 */ 252 [31] = IPRIO_MMAXIPRIO, 253 [30] = IPRIO_MMAXIPRIO, 254 [29] = IPRIO_MMAXIPRIO, 255 [28] = IPRIO_MMAXIPRIO, 256 [27] = IPRIO_MMAXIPRIO, 257 [26] = IPRIO_MMAXIPRIO, 258 [25] = IPRIO_MMAXIPRIO, 259 [24] = IPRIO_MMAXIPRIO, 260 261 [47] = IPRIO_DEFAULT_UPPER, 262 [23] = IPRIO_DEFAULT_UPPER + 1, 263 [46] = IPRIO_DEFAULT_UPPER + 2, 264 [45] = IPRIO_DEFAULT_UPPER + 3, 265 [22] = IPRIO_DEFAULT_UPPER + 4, 266 [44] = IPRIO_DEFAULT_UPPER + 5, 267 268 [43] = IPRIO_DEFAULT_UPPER + 6, 269 [21] = IPRIO_DEFAULT_UPPER + 7, 270 [42] = IPRIO_DEFAULT_UPPER + 8, 271 [41] = IPRIO_DEFAULT_UPPER + 9, 272 [20] = IPRIO_DEFAULT_UPPER + 10, 273 [40] = IPRIO_DEFAULT_UPPER + 11, 274 275 [11] = IPRIO_DEFAULT_M, 276 [3] = IPRIO_DEFAULT_M + 1, 277 [7] = IPRIO_DEFAULT_M + 2, 278 279 [9] = IPRIO_DEFAULT_S, 280 [1] = IPRIO_DEFAULT_S + 1, 281 [5] = IPRIO_DEFAULT_S + 2, 282 283 [12] = IPRIO_DEFAULT_SGEXT, 284 285 [10] = IPRIO_DEFAULT_VS, 286 [2] = IPRIO_DEFAULT_VS + 1, 287 [6] = IPRIO_DEFAULT_VS + 2, 288 289 [39] = IPRIO_DEFAULT_LOWER, 290 [19] = IPRIO_DEFAULT_LOWER + 1, 291 [38] = IPRIO_DEFAULT_LOWER + 2, 292 [37] = IPRIO_DEFAULT_LOWER + 3, 293 [18] = IPRIO_DEFAULT_LOWER + 4, 294 [36] = IPRIO_DEFAULT_LOWER + 5, 295 296 [35] = IPRIO_DEFAULT_LOWER + 6, 297 [17] = IPRIO_DEFAULT_LOWER + 7, 298 [34] = IPRIO_DEFAULT_LOWER + 8, 299 [33] = IPRIO_DEFAULT_LOWER + 9, 300 [16] = IPRIO_DEFAULT_LOWER + 10, 301 [32] = IPRIO_DEFAULT_LOWER + 11, 302 }; 303 304 uint8_t riscv_cpu_default_priority(int irq) 305 { 306 if (irq < 0 || irq > 63) { 307 return IPRIO_MMAXIPRIO; 308 } 309 310 return default_iprio[irq] ? default_iprio[irq] : IPRIO_MMAXIPRIO; 311 }; 312 313 static int riscv_cpu_pending_to_irq(CPURISCVState *env, 314 int extirq, unsigned int extirq_def_prio, 315 uint64_t pending, uint8_t *iprio) 316 { 317 int irq, best_irq = RISCV_EXCP_NONE; 318 unsigned int prio, best_prio = UINT_MAX; 319 320 if (!pending) { 321 return RISCV_EXCP_NONE; 322 } 323 324 irq = ctz64(pending); 325 if (!((extirq == IRQ_M_EXT) ? riscv_cpu_cfg(env)->ext_smaia : 326 riscv_cpu_cfg(env)->ext_ssaia)) { 327 return irq; 328 } 329 330 pending = pending >> irq; 331 while (pending) { 332 prio = iprio[irq]; 333 if (!prio) { 334 if (irq == extirq) { 335 prio = extirq_def_prio; 336 } else { 337 prio = (riscv_cpu_default_priority(irq) < extirq_def_prio) ? 338 1 : IPRIO_MMAXIPRIO; 339 } 340 } 341 if ((pending & 0x1) && (prio <= best_prio)) { 342 best_irq = irq; 343 best_prio = prio; 344 } 345 irq++; 346 pending = pending >> 1; 347 } 348 349 return best_irq; 350 } 351 352 uint64_t riscv_cpu_all_pending(CPURISCVState *env) 353 { 354 uint32_t gein = get_field(env->hstatus, HSTATUS_VGEIN); 355 uint64_t vsgein = (env->hgeip & (1ULL << gein)) ? MIP_VSEIP : 0; 356 uint64_t vstip = (env->vstime_irq) ? MIP_VSTIP : 0; 357 358 return (env->mip | vsgein | vstip) & env->mie; 359 } 360 361 int riscv_cpu_mirq_pending(CPURISCVState *env) 362 { 363 uint64_t irqs = riscv_cpu_all_pending(env) & ~env->mideleg & 364 ~(MIP_SGEIP | MIP_VSSIP | MIP_VSTIP | MIP_VSEIP); 365 366 return riscv_cpu_pending_to_irq(env, IRQ_M_EXT, IPRIO_DEFAULT_M, 367 irqs, env->miprio); 368 } 369 370 int riscv_cpu_sirq_pending(CPURISCVState *env) 371 { 372 uint64_t irqs = riscv_cpu_all_pending(env) & env->mideleg & 373 ~(MIP_VSSIP | MIP_VSTIP | MIP_VSEIP); 374 375 return riscv_cpu_pending_to_irq(env, IRQ_S_EXT, IPRIO_DEFAULT_S, 376 irqs, env->siprio); 377 } 378 379 int riscv_cpu_vsirq_pending(CPURISCVState *env) 380 { 381 uint64_t irqs = riscv_cpu_all_pending(env) & env->mideleg & 382 (MIP_VSSIP | MIP_VSTIP | MIP_VSEIP); 383 384 return riscv_cpu_pending_to_irq(env, IRQ_S_EXT, IPRIO_DEFAULT_S, 385 irqs >> 1, env->hviprio); 386 } 387 388 static int riscv_cpu_local_irq_pending(CPURISCVState *env) 389 { 390 int virq; 391 uint64_t irqs, pending, mie, hsie, vsie; 392 393 /* Determine interrupt enable state of all privilege modes */ 394 if (riscv_cpu_virt_enabled(env)) { 395 mie = 1; 396 hsie = 1; 397 vsie = (env->priv < PRV_S) || 398 (env->priv == PRV_S && get_field(env->mstatus, MSTATUS_SIE)); 399 } else { 400 mie = (env->priv < PRV_M) || 401 (env->priv == PRV_M && get_field(env->mstatus, MSTATUS_MIE)); 402 hsie = (env->priv < PRV_S) || 403 (env->priv == PRV_S && get_field(env->mstatus, MSTATUS_SIE)); 404 vsie = 0; 405 } 406 407 /* Determine all pending interrupts */ 408 pending = riscv_cpu_all_pending(env); 409 410 /* Check M-mode interrupts */ 411 irqs = pending & ~env->mideleg & -mie; 412 if (irqs) { 413 return riscv_cpu_pending_to_irq(env, IRQ_M_EXT, IPRIO_DEFAULT_M, 414 irqs, env->miprio); 415 } 416 417 /* Check HS-mode interrupts */ 418 irqs = pending & env->mideleg & ~env->hideleg & -hsie; 419 if (irqs) { 420 return riscv_cpu_pending_to_irq(env, IRQ_S_EXT, IPRIO_DEFAULT_S, 421 irqs, env->siprio); 422 } 423 424 /* Check VS-mode interrupts */ 425 irqs = pending & env->mideleg & env->hideleg & -vsie; 426 if (irqs) { 427 virq = riscv_cpu_pending_to_irq(env, IRQ_S_EXT, IPRIO_DEFAULT_S, 428 irqs >> 1, env->hviprio); 429 return (virq <= 0) ? virq : virq + 1; 430 } 431 432 /* Indicate no pending interrupt */ 433 return RISCV_EXCP_NONE; 434 } 435 436 bool riscv_cpu_exec_interrupt(CPUState *cs, int interrupt_request) 437 { 438 if (interrupt_request & CPU_INTERRUPT_HARD) { 439 RISCVCPU *cpu = RISCV_CPU(cs); 440 CPURISCVState *env = &cpu->env; 441 int interruptno = riscv_cpu_local_irq_pending(env); 442 if (interruptno >= 0) { 443 cs->exception_index = RISCV_EXCP_INT_FLAG | interruptno; 444 riscv_cpu_do_interrupt(cs); 445 return true; 446 } 447 } 448 return false; 449 } 450 451 /* Return true is floating point support is currently enabled */ 452 bool riscv_cpu_fp_enabled(CPURISCVState *env) 453 { 454 if (env->mstatus & MSTATUS_FS) { 455 if (riscv_cpu_virt_enabled(env) && !(env->mstatus_hs & MSTATUS_FS)) { 456 return false; 457 } 458 return true; 459 } 460 461 return false; 462 } 463 464 /* Return true is vector support is currently enabled */ 465 bool riscv_cpu_vector_enabled(CPURISCVState *env) 466 { 467 if (env->mstatus & MSTATUS_VS) { 468 if (riscv_cpu_virt_enabled(env) && !(env->mstatus_hs & MSTATUS_VS)) { 469 return false; 470 } 471 return true; 472 } 473 474 return false; 475 } 476 477 void riscv_cpu_swap_hypervisor_regs(CPURISCVState *env) 478 { 479 uint64_t mstatus_mask = MSTATUS_MXR | MSTATUS_SUM | 480 MSTATUS_SPP | MSTATUS_SPIE | MSTATUS_SIE | 481 MSTATUS64_UXL | MSTATUS_VS; 482 483 if (riscv_has_ext(env, RVF)) { 484 mstatus_mask |= MSTATUS_FS; 485 } 486 bool current_virt = riscv_cpu_virt_enabled(env); 487 488 g_assert(riscv_has_ext(env, RVH)); 489 490 if (current_virt) { 491 /* Current V=1 and we are about to change to V=0 */ 492 env->vsstatus = env->mstatus & mstatus_mask; 493 env->mstatus &= ~mstatus_mask; 494 env->mstatus |= env->mstatus_hs; 495 496 env->vstvec = env->stvec; 497 env->stvec = env->stvec_hs; 498 499 env->vsscratch = env->sscratch; 500 env->sscratch = env->sscratch_hs; 501 502 env->vsepc = env->sepc; 503 env->sepc = env->sepc_hs; 504 505 env->vscause = env->scause; 506 env->scause = env->scause_hs; 507 508 env->vstval = env->stval; 509 env->stval = env->stval_hs; 510 511 env->vsatp = env->satp; 512 env->satp = env->satp_hs; 513 } else { 514 /* Current V=0 and we are about to change to V=1 */ 515 env->mstatus_hs = env->mstatus & mstatus_mask; 516 env->mstatus &= ~mstatus_mask; 517 env->mstatus |= env->vsstatus; 518 519 env->stvec_hs = env->stvec; 520 env->stvec = env->vstvec; 521 522 env->sscratch_hs = env->sscratch; 523 env->sscratch = env->vsscratch; 524 525 env->sepc_hs = env->sepc; 526 env->sepc = env->vsepc; 527 528 env->scause_hs = env->scause; 529 env->scause = env->vscause; 530 531 env->stval_hs = env->stval; 532 env->stval = env->vstval; 533 534 env->satp_hs = env->satp; 535 env->satp = env->vsatp; 536 } 537 } 538 539 target_ulong riscv_cpu_get_geilen(CPURISCVState *env) 540 { 541 if (!riscv_has_ext(env, RVH)) { 542 return 0; 543 } 544 545 return env->geilen; 546 } 547 548 void riscv_cpu_set_geilen(CPURISCVState *env, target_ulong geilen) 549 { 550 if (!riscv_has_ext(env, RVH)) { 551 return; 552 } 553 554 if (geilen > (TARGET_LONG_BITS - 1)) { 555 return; 556 } 557 558 env->geilen = geilen; 559 } 560 561 bool riscv_cpu_virt_enabled(CPURISCVState *env) 562 { 563 return get_field(env->virt, VIRT_ONOFF); 564 } 565 566 /* This function can only be called to set virt when RVH is enabled */ 567 void riscv_cpu_set_virt_enabled(CPURISCVState *env, bool enable) 568 { 569 /* Flush the TLB on all virt mode changes. */ 570 if (get_field(env->virt, VIRT_ONOFF) != enable) { 571 tlb_flush(env_cpu(env)); 572 } 573 574 env->virt = set_field(env->virt, VIRT_ONOFF, enable); 575 576 if (enable) { 577 /* 578 * The guest external interrupts from an interrupt controller are 579 * delivered only when the Guest/VM is running (i.e. V=1). This means 580 * any guest external interrupt which is triggered while the Guest/VM 581 * is not running (i.e. V=0) will be missed on QEMU resulting in guest 582 * with sluggish response to serial console input and other I/O events. 583 * 584 * To solve this, we check and inject interrupt after setting V=1. 585 */ 586 riscv_cpu_update_mip(env, 0, 0); 587 } 588 } 589 590 bool riscv_cpu_two_stage_lookup(int mmu_idx) 591 { 592 return mmu_idx & TB_FLAGS_PRIV_HYP_ACCESS_MASK; 593 } 594 595 int riscv_cpu_claim_interrupts(RISCVCPU *cpu, uint64_t interrupts) 596 { 597 CPURISCVState *env = &cpu->env; 598 if (env->miclaim & interrupts) { 599 return -1; 600 } else { 601 env->miclaim |= interrupts; 602 return 0; 603 } 604 } 605 606 uint64_t riscv_cpu_update_mip(CPURISCVState *env, uint64_t mask, 607 uint64_t value) 608 { 609 CPUState *cs = env_cpu(env); 610 uint64_t gein, vsgein = 0, vstip = 0, old = env->mip; 611 612 if (riscv_cpu_virt_enabled(env)) { 613 gein = get_field(env->hstatus, HSTATUS_VGEIN); 614 vsgein = (env->hgeip & (1ULL << gein)) ? MIP_VSEIP : 0; 615 } 616 617 vstip = env->vstime_irq ? MIP_VSTIP : 0; 618 619 QEMU_IOTHREAD_LOCK_GUARD(); 620 621 env->mip = (env->mip & ~mask) | (value & mask); 622 623 if (env->mip | vsgein | vstip) { 624 cpu_interrupt(cs, CPU_INTERRUPT_HARD); 625 } else { 626 cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD); 627 } 628 629 return old; 630 } 631 632 void riscv_cpu_set_rdtime_fn(CPURISCVState *env, uint64_t (*fn)(void *), 633 void *arg) 634 { 635 env->rdtime_fn = fn; 636 env->rdtime_fn_arg = arg; 637 } 638 639 void riscv_cpu_set_aia_ireg_rmw_fn(CPURISCVState *env, uint32_t priv, 640 int (*rmw_fn)(void *arg, 641 target_ulong reg, 642 target_ulong *val, 643 target_ulong new_val, 644 target_ulong write_mask), 645 void *rmw_fn_arg) 646 { 647 if (priv <= PRV_M) { 648 env->aia_ireg_rmw_fn[priv] = rmw_fn; 649 env->aia_ireg_rmw_fn_arg[priv] = rmw_fn_arg; 650 } 651 } 652 653 void riscv_cpu_set_mode(CPURISCVState *env, target_ulong newpriv) 654 { 655 if (newpriv > PRV_M) { 656 g_assert_not_reached(); 657 } 658 if (newpriv == PRV_H) { 659 newpriv = PRV_U; 660 } 661 if (icount_enabled() && newpriv != env->priv) { 662 riscv_itrigger_update_priv(env); 663 } 664 /* tlb_flush is unnecessary as mode is contained in mmu_idx */ 665 env->priv = newpriv; 666 env->xl = cpu_recompute_xl(env); 667 riscv_cpu_update_mask(env); 668 669 /* 670 * Clear the load reservation - otherwise a reservation placed in one 671 * context/process can be used by another, resulting in an SC succeeding 672 * incorrectly. Version 2.2 of the ISA specification explicitly requires 673 * this behaviour, while later revisions say that the kernel "should" use 674 * an SC instruction to force the yielding of a load reservation on a 675 * preemptive context switch. As a result, do both. 676 */ 677 env->load_res = -1; 678 } 679 680 /* 681 * get_physical_address_pmp - check PMP permission for this physical address 682 * 683 * Match the PMP region and check permission for this physical address and it's 684 * TLB page. Returns 0 if the permission checking was successful 685 * 686 * @env: CPURISCVState 687 * @prot: The returned protection attributes 688 * @tlb_size: TLB page size containing addr. It could be modified after PMP 689 * permission checking. NULL if not set TLB page for addr. 690 * @addr: The physical address to be checked permission 691 * @access_type: The type of MMU access 692 * @mode: Indicates current privilege level. 693 */ 694 static int get_physical_address_pmp(CPURISCVState *env, int *prot, 695 target_ulong *tlb_size, hwaddr addr, 696 int size, MMUAccessType access_type, 697 int mode) 698 { 699 pmp_priv_t pmp_priv; 700 int pmp_index = -1; 701 702 if (!riscv_cpu_cfg(env)->pmp) { 703 *prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC; 704 return TRANSLATE_SUCCESS; 705 } 706 707 pmp_index = pmp_hart_has_privs(env, addr, size, 1 << access_type, 708 &pmp_priv, mode); 709 if (pmp_index < 0) { 710 *prot = 0; 711 return TRANSLATE_PMP_FAIL; 712 } 713 714 *prot = pmp_priv_to_page_prot(pmp_priv); 715 if ((tlb_size != NULL) && pmp_index != MAX_RISCV_PMPS) { 716 target_ulong tlb_sa = addr & ~(TARGET_PAGE_SIZE - 1); 717 target_ulong tlb_ea = tlb_sa + TARGET_PAGE_SIZE - 1; 718 719 *tlb_size = pmp_get_tlb_size(env, pmp_index, tlb_sa, tlb_ea); 720 } 721 722 return TRANSLATE_SUCCESS; 723 } 724 725 /* get_physical_address - get the physical address for this virtual address 726 * 727 * Do a page table walk to obtain the physical address corresponding to a 728 * virtual address. Returns 0 if the translation was successful 729 * 730 * Adapted from Spike's mmu_t::translate and mmu_t::walk 731 * 732 * @env: CPURISCVState 733 * @physical: This will be set to the calculated physical address 734 * @prot: The returned protection attributes 735 * @addr: The virtual address to be translated 736 * @fault_pte_addr: If not NULL, this will be set to fault pte address 737 * when a error occurs on pte address translation. 738 * This will already be shifted to match htval. 739 * @access_type: The type of MMU access 740 * @mmu_idx: Indicates current privilege level 741 * @first_stage: Are we in first stage translation? 742 * Second stage is used for hypervisor guest translation 743 * @two_stage: Are we going to perform two stage translation 744 * @is_debug: Is this access from a debugger or the monitor? 745 */ 746 static int get_physical_address(CPURISCVState *env, hwaddr *physical, 747 int *prot, target_ulong addr, 748 target_ulong *fault_pte_addr, 749 int access_type, int mmu_idx, 750 bool first_stage, bool two_stage, 751 bool is_debug) 752 { 753 /* NOTE: the env->pc value visible here will not be 754 * correct, but the value visible to the exception handler 755 * (riscv_cpu_do_interrupt) is correct */ 756 MemTxResult res; 757 MemTxAttrs attrs = MEMTXATTRS_UNSPECIFIED; 758 int mode = mmu_idx & TB_FLAGS_PRIV_MMU_MASK; 759 bool use_background = false; 760 hwaddr ppn; 761 int napot_bits = 0; 762 target_ulong napot_mask; 763 764 /* 765 * Check if we should use the background registers for the two 766 * stage translation. We don't need to check if we actually need 767 * two stage translation as that happened before this function 768 * was called. Background registers will be used if the guest has 769 * forced a two stage translation to be on (in HS or M mode). 770 */ 771 if (!riscv_cpu_virt_enabled(env) && two_stage) { 772 use_background = true; 773 } 774 775 /* MPRV does not affect the virtual-machine load/store 776 instructions, HLV, HLVX, and HSV. */ 777 if (riscv_cpu_two_stage_lookup(mmu_idx)) { 778 mode = get_field(env->hstatus, HSTATUS_SPVP); 779 } else if (mode == PRV_M && access_type != MMU_INST_FETCH) { 780 if (get_field(env->mstatus, MSTATUS_MPRV)) { 781 mode = get_field(env->mstatus, MSTATUS_MPP); 782 } 783 } 784 785 if (first_stage == false) { 786 /* We are in stage 2 translation, this is similar to stage 1. */ 787 /* Stage 2 is always taken as U-mode */ 788 mode = PRV_U; 789 } 790 791 if (mode == PRV_M || !riscv_cpu_cfg(env)->mmu) { 792 *physical = addr; 793 *prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC; 794 return TRANSLATE_SUCCESS; 795 } 796 797 *prot = 0; 798 799 hwaddr base; 800 int levels, ptidxbits, ptesize, vm, sum, mxr, widened; 801 802 if (first_stage == true) { 803 mxr = get_field(env->mstatus, MSTATUS_MXR); 804 } else { 805 mxr = get_field(env->vsstatus, MSTATUS_MXR); 806 } 807 808 if (first_stage == true) { 809 if (use_background) { 810 if (riscv_cpu_mxl(env) == MXL_RV32) { 811 base = (hwaddr)get_field(env->vsatp, SATP32_PPN) << PGSHIFT; 812 vm = get_field(env->vsatp, SATP32_MODE); 813 } else { 814 base = (hwaddr)get_field(env->vsatp, SATP64_PPN) << PGSHIFT; 815 vm = get_field(env->vsatp, SATP64_MODE); 816 } 817 } else { 818 if (riscv_cpu_mxl(env) == MXL_RV32) { 819 base = (hwaddr)get_field(env->satp, SATP32_PPN) << PGSHIFT; 820 vm = get_field(env->satp, SATP32_MODE); 821 } else { 822 base = (hwaddr)get_field(env->satp, SATP64_PPN) << PGSHIFT; 823 vm = get_field(env->satp, SATP64_MODE); 824 } 825 } 826 widened = 0; 827 } else { 828 if (riscv_cpu_mxl(env) == MXL_RV32) { 829 base = (hwaddr)get_field(env->hgatp, SATP32_PPN) << PGSHIFT; 830 vm = get_field(env->hgatp, SATP32_MODE); 831 } else { 832 base = (hwaddr)get_field(env->hgatp, SATP64_PPN) << PGSHIFT; 833 vm = get_field(env->hgatp, SATP64_MODE); 834 } 835 widened = 2; 836 } 837 /* status.SUM will be ignored if execute on background */ 838 sum = get_field(env->mstatus, MSTATUS_SUM) || use_background || is_debug; 839 switch (vm) { 840 case VM_1_10_SV32: 841 levels = 2; ptidxbits = 10; ptesize = 4; break; 842 case VM_1_10_SV39: 843 levels = 3; ptidxbits = 9; ptesize = 8; break; 844 case VM_1_10_SV48: 845 levels = 4; ptidxbits = 9; ptesize = 8; break; 846 case VM_1_10_SV57: 847 levels = 5; ptidxbits = 9; ptesize = 8; break; 848 case VM_1_10_MBARE: 849 *physical = addr; 850 *prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC; 851 return TRANSLATE_SUCCESS; 852 default: 853 g_assert_not_reached(); 854 } 855 856 CPUState *cs = env_cpu(env); 857 int va_bits = PGSHIFT + levels * ptidxbits + widened; 858 target_ulong mask, masked_msbs; 859 860 if (TARGET_LONG_BITS > (va_bits - 1)) { 861 mask = (1L << (TARGET_LONG_BITS - (va_bits - 1))) - 1; 862 } else { 863 mask = 0; 864 } 865 masked_msbs = (addr >> (va_bits - 1)) & mask; 866 867 if (masked_msbs != 0 && masked_msbs != mask) { 868 return TRANSLATE_FAIL; 869 } 870 871 int ptshift = (levels - 1) * ptidxbits; 872 int i; 873 874 #if !TCG_OVERSIZED_GUEST 875 restart: 876 #endif 877 for (i = 0; i < levels; i++, ptshift -= ptidxbits) { 878 target_ulong idx; 879 if (i == 0) { 880 idx = (addr >> (PGSHIFT + ptshift)) & 881 ((1 << (ptidxbits + widened)) - 1); 882 } else { 883 idx = (addr >> (PGSHIFT + ptshift)) & 884 ((1 << ptidxbits) - 1); 885 } 886 887 /* check that physical address of PTE is legal */ 888 hwaddr pte_addr; 889 890 if (two_stage && first_stage) { 891 int vbase_prot; 892 hwaddr vbase; 893 894 /* Do the second stage translation on the base PTE address. */ 895 int vbase_ret = get_physical_address(env, &vbase, &vbase_prot, 896 base, NULL, MMU_DATA_LOAD, 897 mmu_idx, false, true, 898 is_debug); 899 900 if (vbase_ret != TRANSLATE_SUCCESS) { 901 if (fault_pte_addr) { 902 *fault_pte_addr = (base + idx * ptesize) >> 2; 903 } 904 return TRANSLATE_G_STAGE_FAIL; 905 } 906 907 pte_addr = vbase + idx * ptesize; 908 } else { 909 pte_addr = base + idx * ptesize; 910 } 911 912 int pmp_prot; 913 int pmp_ret = get_physical_address_pmp(env, &pmp_prot, NULL, pte_addr, 914 sizeof(target_ulong), 915 MMU_DATA_LOAD, PRV_S); 916 if (pmp_ret != TRANSLATE_SUCCESS) { 917 return TRANSLATE_PMP_FAIL; 918 } 919 920 target_ulong pte; 921 if (riscv_cpu_mxl(env) == MXL_RV32) { 922 pte = address_space_ldl(cs->as, pte_addr, attrs, &res); 923 } else { 924 pte = address_space_ldq(cs->as, pte_addr, attrs, &res); 925 } 926 927 if (res != MEMTX_OK) { 928 return TRANSLATE_FAIL; 929 } 930 931 bool pbmte = env->menvcfg & MENVCFG_PBMTE; 932 bool hade = env->menvcfg & MENVCFG_HADE; 933 934 if (first_stage && two_stage && riscv_cpu_virt_enabled(env)) { 935 pbmte = pbmte && (env->henvcfg & HENVCFG_PBMTE); 936 hade = hade && (env->henvcfg & HENVCFG_HADE); 937 } 938 939 if (riscv_cpu_sxl(env) == MXL_RV32) { 940 ppn = pte >> PTE_PPN_SHIFT; 941 } else if (pbmte || riscv_cpu_cfg(env)->ext_svnapot) { 942 ppn = (pte & (target_ulong)PTE_PPN_MASK) >> PTE_PPN_SHIFT; 943 } else { 944 ppn = pte >> PTE_PPN_SHIFT; 945 if ((pte & ~(target_ulong)PTE_PPN_MASK) >> PTE_PPN_SHIFT) { 946 return TRANSLATE_FAIL; 947 } 948 } 949 950 if (!(pte & PTE_V)) { 951 /* Invalid PTE */ 952 return TRANSLATE_FAIL; 953 } else if (!pbmte && (pte & PTE_PBMT)) { 954 return TRANSLATE_FAIL; 955 } else if (!(pte & (PTE_R | PTE_W | PTE_X))) { 956 /* Inner PTE, continue walking */ 957 if (pte & (PTE_D | PTE_A | PTE_U | PTE_ATTR)) { 958 return TRANSLATE_FAIL; 959 } 960 base = ppn << PGSHIFT; 961 } else if ((pte & (PTE_R | PTE_W | PTE_X)) == PTE_W) { 962 /* Reserved leaf PTE flags: PTE_W */ 963 return TRANSLATE_FAIL; 964 } else if ((pte & (PTE_R | PTE_W | PTE_X)) == (PTE_W | PTE_X)) { 965 /* Reserved leaf PTE flags: PTE_W + PTE_X */ 966 return TRANSLATE_FAIL; 967 } else if ((pte & PTE_U) && ((mode != PRV_U) && 968 (!sum || access_type == MMU_INST_FETCH))) { 969 /* User PTE flags when not U mode and mstatus.SUM is not set, 970 or the access type is an instruction fetch */ 971 return TRANSLATE_FAIL; 972 } else if (!(pte & PTE_U) && (mode != PRV_S)) { 973 /* Supervisor PTE flags when not S mode */ 974 return TRANSLATE_FAIL; 975 } else if (ppn & ((1ULL << ptshift) - 1)) { 976 /* Misaligned PPN */ 977 return TRANSLATE_FAIL; 978 } else if (access_type == MMU_DATA_LOAD && !((pte & PTE_R) || 979 ((pte & PTE_X) && mxr))) { 980 /* Read access check failed */ 981 return TRANSLATE_FAIL; 982 } else if (access_type == MMU_DATA_STORE && !(pte & PTE_W)) { 983 /* Write access check failed */ 984 return TRANSLATE_FAIL; 985 } else if (access_type == MMU_INST_FETCH && !(pte & PTE_X)) { 986 /* Fetch access check failed */ 987 return TRANSLATE_FAIL; 988 } else { 989 /* if necessary, set accessed and dirty bits. */ 990 target_ulong updated_pte = pte | PTE_A | 991 (access_type == MMU_DATA_STORE ? PTE_D : 0); 992 993 /* Page table updates need to be atomic with MTTCG enabled */ 994 if (updated_pte != pte) { 995 if (!hade) { 996 return TRANSLATE_FAIL; 997 } 998 999 /* 1000 * - if accessed or dirty bits need updating, and the PTE is 1001 * in RAM, then we do so atomically with a compare and swap. 1002 * - if the PTE is in IO space or ROM, then it can't be updated 1003 * and we return TRANSLATE_FAIL. 1004 * - if the PTE changed by the time we went to update it, then 1005 * it is no longer valid and we must re-walk the page table. 1006 */ 1007 MemoryRegion *mr; 1008 hwaddr l = sizeof(target_ulong), addr1; 1009 mr = address_space_translate(cs->as, pte_addr, 1010 &addr1, &l, false, MEMTXATTRS_UNSPECIFIED); 1011 if (memory_region_is_ram(mr)) { 1012 target_ulong *pte_pa = 1013 qemu_map_ram_ptr(mr->ram_block, addr1); 1014 #if TCG_OVERSIZED_GUEST 1015 /* MTTCG is not enabled on oversized TCG guests so 1016 * page table updates do not need to be atomic */ 1017 *pte_pa = pte = updated_pte; 1018 #else 1019 target_ulong old_pte = 1020 qatomic_cmpxchg(pte_pa, pte, updated_pte); 1021 if (old_pte != pte) { 1022 goto restart; 1023 } else { 1024 pte = updated_pte; 1025 } 1026 #endif 1027 } else { 1028 /* misconfigured PTE in ROM (AD bits are not preset) or 1029 * PTE is in IO space and can't be updated atomically */ 1030 return TRANSLATE_FAIL; 1031 } 1032 } 1033 1034 /* for superpage mappings, make a fake leaf PTE for the TLB's 1035 benefit. */ 1036 target_ulong vpn = addr >> PGSHIFT; 1037 1038 if (riscv_cpu_cfg(env)->ext_svnapot && (pte & PTE_N)) { 1039 napot_bits = ctzl(ppn) + 1; 1040 if ((i != (levels - 1)) || (napot_bits != 4)) { 1041 return TRANSLATE_FAIL; 1042 } 1043 } 1044 1045 napot_mask = (1 << napot_bits) - 1; 1046 *physical = (((ppn & ~napot_mask) | (vpn & napot_mask) | 1047 (vpn & (((target_ulong)1 << ptshift) - 1)) 1048 ) << PGSHIFT) | (addr & ~TARGET_PAGE_MASK); 1049 1050 /* set permissions on the TLB entry */ 1051 if ((pte & PTE_R) || ((pte & PTE_X) && mxr)) { 1052 *prot |= PAGE_READ; 1053 } 1054 if ((pte & PTE_X)) { 1055 *prot |= PAGE_EXEC; 1056 } 1057 /* add write permission on stores or if the page is already dirty, 1058 so that we TLB miss on later writes to update the dirty bit */ 1059 if ((pte & PTE_W) && 1060 (access_type == MMU_DATA_STORE || (pte & PTE_D))) { 1061 *prot |= PAGE_WRITE; 1062 } 1063 return TRANSLATE_SUCCESS; 1064 } 1065 } 1066 return TRANSLATE_FAIL; 1067 } 1068 1069 static void raise_mmu_exception(CPURISCVState *env, target_ulong address, 1070 MMUAccessType access_type, bool pmp_violation, 1071 bool first_stage, bool two_stage, 1072 bool two_stage_indirect) 1073 { 1074 CPUState *cs = env_cpu(env); 1075 int page_fault_exceptions, vm; 1076 uint64_t stap_mode; 1077 1078 if (riscv_cpu_mxl(env) == MXL_RV32) { 1079 stap_mode = SATP32_MODE; 1080 } else { 1081 stap_mode = SATP64_MODE; 1082 } 1083 1084 if (first_stage) { 1085 vm = get_field(env->satp, stap_mode); 1086 } else { 1087 vm = get_field(env->hgatp, stap_mode); 1088 } 1089 1090 page_fault_exceptions = vm != VM_1_10_MBARE && !pmp_violation; 1091 1092 switch (access_type) { 1093 case MMU_INST_FETCH: 1094 if (riscv_cpu_virt_enabled(env) && !first_stage) { 1095 cs->exception_index = RISCV_EXCP_INST_GUEST_PAGE_FAULT; 1096 } else { 1097 cs->exception_index = page_fault_exceptions ? 1098 RISCV_EXCP_INST_PAGE_FAULT : RISCV_EXCP_INST_ACCESS_FAULT; 1099 } 1100 break; 1101 case MMU_DATA_LOAD: 1102 if (two_stage && !first_stage) { 1103 cs->exception_index = RISCV_EXCP_LOAD_GUEST_ACCESS_FAULT; 1104 } else { 1105 cs->exception_index = page_fault_exceptions ? 1106 RISCV_EXCP_LOAD_PAGE_FAULT : RISCV_EXCP_LOAD_ACCESS_FAULT; 1107 } 1108 break; 1109 case MMU_DATA_STORE: 1110 if (two_stage && !first_stage) { 1111 cs->exception_index = RISCV_EXCP_STORE_GUEST_AMO_ACCESS_FAULT; 1112 } else { 1113 cs->exception_index = page_fault_exceptions ? 1114 RISCV_EXCP_STORE_PAGE_FAULT : RISCV_EXCP_STORE_AMO_ACCESS_FAULT; 1115 } 1116 break; 1117 default: 1118 g_assert_not_reached(); 1119 } 1120 env->badaddr = address; 1121 env->two_stage_lookup = two_stage; 1122 env->two_stage_indirect_lookup = two_stage_indirect; 1123 } 1124 1125 hwaddr riscv_cpu_get_phys_page_debug(CPUState *cs, vaddr addr) 1126 { 1127 RISCVCPU *cpu = RISCV_CPU(cs); 1128 CPURISCVState *env = &cpu->env; 1129 hwaddr phys_addr; 1130 int prot; 1131 int mmu_idx = cpu_mmu_index(&cpu->env, false); 1132 1133 if (get_physical_address(env, &phys_addr, &prot, addr, NULL, 0, mmu_idx, 1134 true, riscv_cpu_virt_enabled(env), true)) { 1135 return -1; 1136 } 1137 1138 if (riscv_cpu_virt_enabled(env)) { 1139 if (get_physical_address(env, &phys_addr, &prot, phys_addr, NULL, 1140 0, mmu_idx, false, true, true)) { 1141 return -1; 1142 } 1143 } 1144 1145 return phys_addr & TARGET_PAGE_MASK; 1146 } 1147 1148 void riscv_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr, 1149 vaddr addr, unsigned size, 1150 MMUAccessType access_type, 1151 int mmu_idx, MemTxAttrs attrs, 1152 MemTxResult response, uintptr_t retaddr) 1153 { 1154 RISCVCPU *cpu = RISCV_CPU(cs); 1155 CPURISCVState *env = &cpu->env; 1156 1157 if (access_type == MMU_DATA_STORE) { 1158 cs->exception_index = RISCV_EXCP_STORE_AMO_ACCESS_FAULT; 1159 } else if (access_type == MMU_DATA_LOAD) { 1160 cs->exception_index = RISCV_EXCP_LOAD_ACCESS_FAULT; 1161 } else { 1162 cs->exception_index = RISCV_EXCP_INST_ACCESS_FAULT; 1163 } 1164 1165 env->badaddr = addr; 1166 env->two_stage_lookup = riscv_cpu_virt_enabled(env) || 1167 riscv_cpu_two_stage_lookup(mmu_idx); 1168 env->two_stage_indirect_lookup = false; 1169 cpu_loop_exit_restore(cs, retaddr); 1170 } 1171 1172 void riscv_cpu_do_unaligned_access(CPUState *cs, vaddr addr, 1173 MMUAccessType access_type, int mmu_idx, 1174 uintptr_t retaddr) 1175 { 1176 RISCVCPU *cpu = RISCV_CPU(cs); 1177 CPURISCVState *env = &cpu->env; 1178 switch (access_type) { 1179 case MMU_INST_FETCH: 1180 cs->exception_index = RISCV_EXCP_INST_ADDR_MIS; 1181 break; 1182 case MMU_DATA_LOAD: 1183 cs->exception_index = RISCV_EXCP_LOAD_ADDR_MIS; 1184 break; 1185 case MMU_DATA_STORE: 1186 cs->exception_index = RISCV_EXCP_STORE_AMO_ADDR_MIS; 1187 break; 1188 default: 1189 g_assert_not_reached(); 1190 } 1191 env->badaddr = addr; 1192 env->two_stage_lookup = riscv_cpu_virt_enabled(env) || 1193 riscv_cpu_two_stage_lookup(mmu_idx); 1194 env->two_stage_indirect_lookup = false; 1195 cpu_loop_exit_restore(cs, retaddr); 1196 } 1197 1198 1199 static void pmu_tlb_fill_incr_ctr(RISCVCPU *cpu, MMUAccessType access_type) 1200 { 1201 enum riscv_pmu_event_idx pmu_event_type; 1202 1203 switch (access_type) { 1204 case MMU_INST_FETCH: 1205 pmu_event_type = RISCV_PMU_EVENT_CACHE_ITLB_PREFETCH_MISS; 1206 break; 1207 case MMU_DATA_LOAD: 1208 pmu_event_type = RISCV_PMU_EVENT_CACHE_DTLB_READ_MISS; 1209 break; 1210 case MMU_DATA_STORE: 1211 pmu_event_type = RISCV_PMU_EVENT_CACHE_DTLB_WRITE_MISS; 1212 break; 1213 default: 1214 return; 1215 } 1216 1217 riscv_pmu_incr_ctr(cpu, pmu_event_type); 1218 } 1219 1220 bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size, 1221 MMUAccessType access_type, int mmu_idx, 1222 bool probe, uintptr_t retaddr) 1223 { 1224 RISCVCPU *cpu = RISCV_CPU(cs); 1225 CPURISCVState *env = &cpu->env; 1226 vaddr im_address; 1227 hwaddr pa = 0; 1228 int prot, prot2, prot_pmp; 1229 bool pmp_violation = false; 1230 bool first_stage_error = true; 1231 bool two_stage_lookup = false; 1232 bool two_stage_indirect_error = false; 1233 int ret = TRANSLATE_FAIL; 1234 int mode = mmu_idx; 1235 /* default TLB page size */ 1236 target_ulong tlb_size = TARGET_PAGE_SIZE; 1237 1238 env->guest_phys_fault_addr = 0; 1239 1240 qemu_log_mask(CPU_LOG_MMU, "%s ad %" VADDR_PRIx " rw %d mmu_idx %d\n", 1241 __func__, address, access_type, mmu_idx); 1242 1243 /* MPRV does not affect the virtual-machine load/store 1244 instructions, HLV, HLVX, and HSV. */ 1245 if (riscv_cpu_two_stage_lookup(mmu_idx)) { 1246 mode = get_field(env->hstatus, HSTATUS_SPVP); 1247 } else if (mode == PRV_M && access_type != MMU_INST_FETCH && 1248 get_field(env->mstatus, MSTATUS_MPRV)) { 1249 mode = get_field(env->mstatus, MSTATUS_MPP); 1250 if (riscv_has_ext(env, RVH) && get_field(env->mstatus, MSTATUS_MPV)) { 1251 two_stage_lookup = true; 1252 } 1253 } 1254 1255 pmu_tlb_fill_incr_ctr(cpu, access_type); 1256 if (riscv_cpu_virt_enabled(env) || 1257 ((riscv_cpu_two_stage_lookup(mmu_idx) || two_stage_lookup) && 1258 access_type != MMU_INST_FETCH)) { 1259 /* Two stage lookup */ 1260 ret = get_physical_address(env, &pa, &prot, address, 1261 &env->guest_phys_fault_addr, access_type, 1262 mmu_idx, true, true, false); 1263 1264 /* 1265 * A G-stage exception may be triggered during two state lookup. 1266 * And the env->guest_phys_fault_addr has already been set in 1267 * get_physical_address(). 1268 */ 1269 if (ret == TRANSLATE_G_STAGE_FAIL) { 1270 first_stage_error = false; 1271 two_stage_indirect_error = true; 1272 access_type = MMU_DATA_LOAD; 1273 } 1274 1275 qemu_log_mask(CPU_LOG_MMU, 1276 "%s 1st-stage address=%" VADDR_PRIx " ret %d physical " 1277 HWADDR_FMT_plx " prot %d\n", 1278 __func__, address, ret, pa, prot); 1279 1280 if (ret == TRANSLATE_SUCCESS) { 1281 /* Second stage lookup */ 1282 im_address = pa; 1283 1284 ret = get_physical_address(env, &pa, &prot2, im_address, NULL, 1285 access_type, mmu_idx, false, true, 1286 false); 1287 1288 qemu_log_mask(CPU_LOG_MMU, 1289 "%s 2nd-stage address=%" VADDR_PRIx " ret %d physical " 1290 HWADDR_FMT_plx " prot %d\n", 1291 __func__, im_address, ret, pa, prot2); 1292 1293 prot &= prot2; 1294 1295 if (ret == TRANSLATE_SUCCESS) { 1296 ret = get_physical_address_pmp(env, &prot_pmp, &tlb_size, pa, 1297 size, access_type, mode); 1298 1299 qemu_log_mask(CPU_LOG_MMU, 1300 "%s PMP address=" HWADDR_FMT_plx " ret %d prot" 1301 " %d tlb_size " TARGET_FMT_lu "\n", 1302 __func__, pa, ret, prot_pmp, tlb_size); 1303 1304 prot &= prot_pmp; 1305 } 1306 1307 if (ret != TRANSLATE_SUCCESS) { 1308 /* 1309 * Guest physical address translation failed, this is a HS 1310 * level exception 1311 */ 1312 first_stage_error = false; 1313 env->guest_phys_fault_addr = (im_address | 1314 (address & 1315 (TARGET_PAGE_SIZE - 1))) >> 2; 1316 } 1317 } 1318 } else { 1319 /* Single stage lookup */ 1320 ret = get_physical_address(env, &pa, &prot, address, NULL, 1321 access_type, mmu_idx, true, false, false); 1322 1323 qemu_log_mask(CPU_LOG_MMU, 1324 "%s address=%" VADDR_PRIx " ret %d physical " 1325 HWADDR_FMT_plx " prot %d\n", 1326 __func__, address, ret, pa, prot); 1327 1328 if (ret == TRANSLATE_SUCCESS) { 1329 ret = get_physical_address_pmp(env, &prot_pmp, &tlb_size, pa, 1330 size, access_type, mode); 1331 1332 qemu_log_mask(CPU_LOG_MMU, 1333 "%s PMP address=" HWADDR_FMT_plx " ret %d prot" 1334 " %d tlb_size " TARGET_FMT_lu "\n", 1335 __func__, pa, ret, prot_pmp, tlb_size); 1336 1337 prot &= prot_pmp; 1338 } 1339 } 1340 1341 if (ret == TRANSLATE_PMP_FAIL) { 1342 pmp_violation = true; 1343 } 1344 1345 if (ret == TRANSLATE_SUCCESS) { 1346 tlb_set_page(cs, address & ~(tlb_size - 1), pa & ~(tlb_size - 1), 1347 prot, mmu_idx, tlb_size); 1348 return true; 1349 } else if (probe) { 1350 return false; 1351 } else { 1352 raise_mmu_exception(env, address, access_type, pmp_violation, 1353 first_stage_error, 1354 riscv_cpu_virt_enabled(env) || 1355 riscv_cpu_two_stage_lookup(mmu_idx), 1356 two_stage_indirect_error); 1357 cpu_loop_exit_restore(cs, retaddr); 1358 } 1359 1360 return true; 1361 } 1362 1363 static target_ulong riscv_transformed_insn(CPURISCVState *env, 1364 target_ulong insn, 1365 target_ulong taddr) 1366 { 1367 target_ulong xinsn = 0; 1368 target_ulong access_rs1 = 0, access_imm = 0, access_size = 0; 1369 1370 /* 1371 * Only Quadrant 0 and Quadrant 2 of RVC instruction space need to 1372 * be uncompressed. The Quadrant 1 of RVC instruction space need 1373 * not be transformed because these instructions won't generate 1374 * any load/store trap. 1375 */ 1376 1377 if ((insn & 0x3) != 0x3) { 1378 /* Transform 16bit instruction into 32bit instruction */ 1379 switch (GET_C_OP(insn)) { 1380 case OPC_RISC_C_OP_QUAD0: /* Quadrant 0 */ 1381 switch (GET_C_FUNC(insn)) { 1382 case OPC_RISC_C_FUNC_FLD_LQ: 1383 if (riscv_cpu_xlen(env) != 128) { /* C.FLD (RV32/64) */ 1384 xinsn = OPC_RISC_FLD; 1385 xinsn = SET_RD(xinsn, GET_C_RS2S(insn)); 1386 access_rs1 = GET_C_RS1S(insn); 1387 access_imm = GET_C_LD_IMM(insn); 1388 access_size = 8; 1389 } 1390 break; 1391 case OPC_RISC_C_FUNC_LW: /* C.LW */ 1392 xinsn = OPC_RISC_LW; 1393 xinsn = SET_RD(xinsn, GET_C_RS2S(insn)); 1394 access_rs1 = GET_C_RS1S(insn); 1395 access_imm = GET_C_LW_IMM(insn); 1396 access_size = 4; 1397 break; 1398 case OPC_RISC_C_FUNC_FLW_LD: 1399 if (riscv_cpu_xlen(env) == 32) { /* C.FLW (RV32) */ 1400 xinsn = OPC_RISC_FLW; 1401 xinsn = SET_RD(xinsn, GET_C_RS2S(insn)); 1402 access_rs1 = GET_C_RS1S(insn); 1403 access_imm = GET_C_LW_IMM(insn); 1404 access_size = 4; 1405 } else { /* C.LD (RV64/RV128) */ 1406 xinsn = OPC_RISC_LD; 1407 xinsn = SET_RD(xinsn, GET_C_RS2S(insn)); 1408 access_rs1 = GET_C_RS1S(insn); 1409 access_imm = GET_C_LD_IMM(insn); 1410 access_size = 8; 1411 } 1412 break; 1413 case OPC_RISC_C_FUNC_FSD_SQ: 1414 if (riscv_cpu_xlen(env) != 128) { /* C.FSD (RV32/64) */ 1415 xinsn = OPC_RISC_FSD; 1416 xinsn = SET_RS2(xinsn, GET_C_RS2S(insn)); 1417 access_rs1 = GET_C_RS1S(insn); 1418 access_imm = GET_C_SD_IMM(insn); 1419 access_size = 8; 1420 } 1421 break; 1422 case OPC_RISC_C_FUNC_SW: /* C.SW */ 1423 xinsn = OPC_RISC_SW; 1424 xinsn = SET_RS2(xinsn, GET_C_RS2S(insn)); 1425 access_rs1 = GET_C_RS1S(insn); 1426 access_imm = GET_C_SW_IMM(insn); 1427 access_size = 4; 1428 break; 1429 case OPC_RISC_C_FUNC_FSW_SD: 1430 if (riscv_cpu_xlen(env) == 32) { /* C.FSW (RV32) */ 1431 xinsn = OPC_RISC_FSW; 1432 xinsn = SET_RS2(xinsn, GET_C_RS2S(insn)); 1433 access_rs1 = GET_C_RS1S(insn); 1434 access_imm = GET_C_SW_IMM(insn); 1435 access_size = 4; 1436 } else { /* C.SD (RV64/RV128) */ 1437 xinsn = OPC_RISC_SD; 1438 xinsn = SET_RS2(xinsn, GET_C_RS2S(insn)); 1439 access_rs1 = GET_C_RS1S(insn); 1440 access_imm = GET_C_SD_IMM(insn); 1441 access_size = 8; 1442 } 1443 break; 1444 default: 1445 break; 1446 } 1447 break; 1448 case OPC_RISC_C_OP_QUAD2: /* Quadrant 2 */ 1449 switch (GET_C_FUNC(insn)) { 1450 case OPC_RISC_C_FUNC_FLDSP_LQSP: 1451 if (riscv_cpu_xlen(env) != 128) { /* C.FLDSP (RV32/64) */ 1452 xinsn = OPC_RISC_FLD; 1453 xinsn = SET_RD(xinsn, GET_C_RD(insn)); 1454 access_rs1 = 2; 1455 access_imm = GET_C_LDSP_IMM(insn); 1456 access_size = 8; 1457 } 1458 break; 1459 case OPC_RISC_C_FUNC_LWSP: /* C.LWSP */ 1460 xinsn = OPC_RISC_LW; 1461 xinsn = SET_RD(xinsn, GET_C_RD(insn)); 1462 access_rs1 = 2; 1463 access_imm = GET_C_LWSP_IMM(insn); 1464 access_size = 4; 1465 break; 1466 case OPC_RISC_C_FUNC_FLWSP_LDSP: 1467 if (riscv_cpu_xlen(env) == 32) { /* C.FLWSP (RV32) */ 1468 xinsn = OPC_RISC_FLW; 1469 xinsn = SET_RD(xinsn, GET_C_RD(insn)); 1470 access_rs1 = 2; 1471 access_imm = GET_C_LWSP_IMM(insn); 1472 access_size = 4; 1473 } else { /* C.LDSP (RV64/RV128) */ 1474 xinsn = OPC_RISC_LD; 1475 xinsn = SET_RD(xinsn, GET_C_RD(insn)); 1476 access_rs1 = 2; 1477 access_imm = GET_C_LDSP_IMM(insn); 1478 access_size = 8; 1479 } 1480 break; 1481 case OPC_RISC_C_FUNC_FSDSP_SQSP: 1482 if (riscv_cpu_xlen(env) != 128) { /* C.FSDSP (RV32/64) */ 1483 xinsn = OPC_RISC_FSD; 1484 xinsn = SET_RS2(xinsn, GET_C_RS2(insn)); 1485 access_rs1 = 2; 1486 access_imm = GET_C_SDSP_IMM(insn); 1487 access_size = 8; 1488 } 1489 break; 1490 case OPC_RISC_C_FUNC_SWSP: /* C.SWSP */ 1491 xinsn = OPC_RISC_SW; 1492 xinsn = SET_RS2(xinsn, GET_C_RS2(insn)); 1493 access_rs1 = 2; 1494 access_imm = GET_C_SWSP_IMM(insn); 1495 access_size = 4; 1496 break; 1497 case 7: 1498 if (riscv_cpu_xlen(env) == 32) { /* C.FSWSP (RV32) */ 1499 xinsn = OPC_RISC_FSW; 1500 xinsn = SET_RS2(xinsn, GET_C_RS2(insn)); 1501 access_rs1 = 2; 1502 access_imm = GET_C_SWSP_IMM(insn); 1503 access_size = 4; 1504 } else { /* C.SDSP (RV64/RV128) */ 1505 xinsn = OPC_RISC_SD; 1506 xinsn = SET_RS2(xinsn, GET_C_RS2(insn)); 1507 access_rs1 = 2; 1508 access_imm = GET_C_SDSP_IMM(insn); 1509 access_size = 8; 1510 } 1511 break; 1512 default: 1513 break; 1514 } 1515 break; 1516 default: 1517 break; 1518 } 1519 1520 /* 1521 * Clear Bit1 of transformed instruction to indicate that 1522 * original insruction was a 16bit instruction 1523 */ 1524 xinsn &= ~((target_ulong)0x2); 1525 } else { 1526 /* Transform 32bit (or wider) instructions */ 1527 switch (MASK_OP_MAJOR(insn)) { 1528 case OPC_RISC_ATOMIC: 1529 xinsn = insn; 1530 access_rs1 = GET_RS1(insn); 1531 access_size = 1 << GET_FUNCT3(insn); 1532 break; 1533 case OPC_RISC_LOAD: 1534 case OPC_RISC_FP_LOAD: 1535 xinsn = SET_I_IMM(insn, 0); 1536 access_rs1 = GET_RS1(insn); 1537 access_imm = GET_IMM(insn); 1538 access_size = 1 << GET_FUNCT3(insn); 1539 break; 1540 case OPC_RISC_STORE: 1541 case OPC_RISC_FP_STORE: 1542 xinsn = SET_S_IMM(insn, 0); 1543 access_rs1 = GET_RS1(insn); 1544 access_imm = GET_STORE_IMM(insn); 1545 access_size = 1 << GET_FUNCT3(insn); 1546 break; 1547 case OPC_RISC_SYSTEM: 1548 if (MASK_OP_SYSTEM(insn) == OPC_RISC_HLVHSV) { 1549 xinsn = insn; 1550 access_rs1 = GET_RS1(insn); 1551 access_size = 1 << ((GET_FUNCT7(insn) >> 1) & 0x3); 1552 access_size = 1 << access_size; 1553 } 1554 break; 1555 default: 1556 break; 1557 } 1558 } 1559 1560 if (access_size) { 1561 xinsn = SET_RS1(xinsn, (taddr - (env->gpr[access_rs1] + access_imm)) & 1562 (access_size - 1)); 1563 } 1564 1565 return xinsn; 1566 } 1567 #endif /* !CONFIG_USER_ONLY */ 1568 1569 /* 1570 * Handle Traps 1571 * 1572 * Adapted from Spike's processor_t::take_trap. 1573 * 1574 */ 1575 void riscv_cpu_do_interrupt(CPUState *cs) 1576 { 1577 #if !defined(CONFIG_USER_ONLY) 1578 1579 RISCVCPU *cpu = RISCV_CPU(cs); 1580 CPURISCVState *env = &cpu->env; 1581 bool write_gva = false; 1582 uint64_t s; 1583 1584 /* cs->exception is 32-bits wide unlike mcause which is XLEN-bits wide 1585 * so we mask off the MSB and separate into trap type and cause. 1586 */ 1587 bool async = !!(cs->exception_index & RISCV_EXCP_INT_FLAG); 1588 target_ulong cause = cs->exception_index & RISCV_EXCP_INT_MASK; 1589 uint64_t deleg = async ? env->mideleg : env->medeleg; 1590 target_ulong tval = 0; 1591 target_ulong tinst = 0; 1592 target_ulong htval = 0; 1593 target_ulong mtval2 = 0; 1594 1595 if (cause == RISCV_EXCP_SEMIHOST) { 1596 do_common_semihosting(cs); 1597 env->pc += 4; 1598 return; 1599 } 1600 1601 if (!async) { 1602 /* set tval to badaddr for traps with address information */ 1603 switch (cause) { 1604 case RISCV_EXCP_LOAD_GUEST_ACCESS_FAULT: 1605 case RISCV_EXCP_STORE_GUEST_AMO_ACCESS_FAULT: 1606 case RISCV_EXCP_LOAD_ADDR_MIS: 1607 case RISCV_EXCP_STORE_AMO_ADDR_MIS: 1608 case RISCV_EXCP_LOAD_ACCESS_FAULT: 1609 case RISCV_EXCP_STORE_AMO_ACCESS_FAULT: 1610 case RISCV_EXCP_LOAD_PAGE_FAULT: 1611 case RISCV_EXCP_STORE_PAGE_FAULT: 1612 write_gva = env->two_stage_lookup; 1613 tval = env->badaddr; 1614 if (env->two_stage_indirect_lookup) { 1615 /* 1616 * special pseudoinstruction for G-stage fault taken while 1617 * doing VS-stage page table walk. 1618 */ 1619 tinst = (riscv_cpu_xlen(env) == 32) ? 0x00002000 : 0x00003000; 1620 } else { 1621 /* 1622 * The "Addr. Offset" field in transformed instruction is 1623 * non-zero only for misaligned access. 1624 */ 1625 tinst = riscv_transformed_insn(env, env->bins, tval); 1626 } 1627 break; 1628 case RISCV_EXCP_INST_GUEST_PAGE_FAULT: 1629 case RISCV_EXCP_INST_ADDR_MIS: 1630 case RISCV_EXCP_INST_ACCESS_FAULT: 1631 case RISCV_EXCP_INST_PAGE_FAULT: 1632 write_gva = env->two_stage_lookup; 1633 tval = env->badaddr; 1634 if (env->two_stage_indirect_lookup) { 1635 /* 1636 * special pseudoinstruction for G-stage fault taken while 1637 * doing VS-stage page table walk. 1638 */ 1639 tinst = (riscv_cpu_xlen(env) == 32) ? 0x00002000 : 0x00003000; 1640 } 1641 break; 1642 case RISCV_EXCP_ILLEGAL_INST: 1643 case RISCV_EXCP_VIRT_INSTRUCTION_FAULT: 1644 tval = env->bins; 1645 break; 1646 case RISCV_EXCP_BREAKPOINT: 1647 if (cs->watchpoint_hit) { 1648 tval = cs->watchpoint_hit->hitaddr; 1649 cs->watchpoint_hit = NULL; 1650 } 1651 break; 1652 default: 1653 break; 1654 } 1655 /* ecall is dispatched as one cause so translate based on mode */ 1656 if (cause == RISCV_EXCP_U_ECALL) { 1657 assert(env->priv <= 3); 1658 1659 if (env->priv == PRV_M) { 1660 cause = RISCV_EXCP_M_ECALL; 1661 } else if (env->priv == PRV_S && riscv_cpu_virt_enabled(env)) { 1662 cause = RISCV_EXCP_VS_ECALL; 1663 } else if (env->priv == PRV_S && !riscv_cpu_virt_enabled(env)) { 1664 cause = RISCV_EXCP_S_ECALL; 1665 } else if (env->priv == PRV_U) { 1666 cause = RISCV_EXCP_U_ECALL; 1667 } 1668 } 1669 } 1670 1671 trace_riscv_trap(env->mhartid, async, cause, env->pc, tval, 1672 riscv_cpu_get_trap_name(cause, async)); 1673 1674 qemu_log_mask(CPU_LOG_INT, 1675 "%s: hart:"TARGET_FMT_ld", async:%d, cause:"TARGET_FMT_lx", " 1676 "epc:0x"TARGET_FMT_lx", tval:0x"TARGET_FMT_lx", desc=%s\n", 1677 __func__, env->mhartid, async, cause, env->pc, tval, 1678 riscv_cpu_get_trap_name(cause, async)); 1679 1680 if (env->priv <= PRV_S && 1681 cause < TARGET_LONG_BITS && ((deleg >> cause) & 1)) { 1682 /* handle the trap in S-mode */ 1683 if (riscv_has_ext(env, RVH)) { 1684 uint64_t hdeleg = async ? env->hideleg : env->hedeleg; 1685 1686 if (riscv_cpu_virt_enabled(env) && ((hdeleg >> cause) & 1)) { 1687 /* Trap to VS mode */ 1688 /* 1689 * See if we need to adjust cause. Yes if its VS mode interrupt 1690 * no if hypervisor has delegated one of hs mode's interrupt 1691 */ 1692 if (cause == IRQ_VS_TIMER || cause == IRQ_VS_SOFT || 1693 cause == IRQ_VS_EXT) { 1694 cause = cause - 1; 1695 } 1696 write_gva = false; 1697 } else if (riscv_cpu_virt_enabled(env)) { 1698 /* Trap into HS mode, from virt */ 1699 riscv_cpu_swap_hypervisor_regs(env); 1700 env->hstatus = set_field(env->hstatus, HSTATUS_SPVP, 1701 env->priv); 1702 env->hstatus = set_field(env->hstatus, HSTATUS_SPV, true); 1703 1704 htval = env->guest_phys_fault_addr; 1705 1706 riscv_cpu_set_virt_enabled(env, 0); 1707 } else { 1708 /* Trap into HS mode */ 1709 env->hstatus = set_field(env->hstatus, HSTATUS_SPV, false); 1710 htval = env->guest_phys_fault_addr; 1711 } 1712 env->hstatus = set_field(env->hstatus, HSTATUS_GVA, write_gva); 1713 } 1714 1715 s = env->mstatus; 1716 s = set_field(s, MSTATUS_SPIE, get_field(s, MSTATUS_SIE)); 1717 s = set_field(s, MSTATUS_SPP, env->priv); 1718 s = set_field(s, MSTATUS_SIE, 0); 1719 env->mstatus = s; 1720 env->scause = cause | ((target_ulong)async << (TARGET_LONG_BITS - 1)); 1721 env->sepc = env->pc; 1722 env->stval = tval; 1723 env->htval = htval; 1724 env->htinst = tinst; 1725 env->pc = (env->stvec >> 2 << 2) + 1726 ((async && (env->stvec & 3) == 1) ? cause * 4 : 0); 1727 riscv_cpu_set_mode(env, PRV_S); 1728 } else { 1729 /* handle the trap in M-mode */ 1730 if (riscv_has_ext(env, RVH)) { 1731 if (riscv_cpu_virt_enabled(env)) { 1732 riscv_cpu_swap_hypervisor_regs(env); 1733 } 1734 env->mstatus = set_field(env->mstatus, MSTATUS_MPV, 1735 riscv_cpu_virt_enabled(env)); 1736 if (riscv_cpu_virt_enabled(env) && tval) { 1737 env->mstatus = set_field(env->mstatus, MSTATUS_GVA, 1); 1738 } 1739 1740 mtval2 = env->guest_phys_fault_addr; 1741 1742 /* Trapping to M mode, virt is disabled */ 1743 riscv_cpu_set_virt_enabled(env, 0); 1744 } 1745 1746 s = env->mstatus; 1747 s = set_field(s, MSTATUS_MPIE, get_field(s, MSTATUS_MIE)); 1748 s = set_field(s, MSTATUS_MPP, env->priv); 1749 s = set_field(s, MSTATUS_MIE, 0); 1750 env->mstatus = s; 1751 env->mcause = cause | ~(((target_ulong)-1) >> async); 1752 env->mepc = env->pc; 1753 env->mtval = tval; 1754 env->mtval2 = mtval2; 1755 env->mtinst = tinst; 1756 env->pc = (env->mtvec >> 2 << 2) + 1757 ((async && (env->mtvec & 3) == 1) ? cause * 4 : 0); 1758 riscv_cpu_set_mode(env, PRV_M); 1759 } 1760 1761 /* NOTE: it is not necessary to yield load reservations here. It is only 1762 * necessary for an SC from "another hart" to cause a load reservation 1763 * to be yielded. Refer to the memory consistency model section of the 1764 * RISC-V ISA Specification. 1765 */ 1766 1767 env->two_stage_lookup = false; 1768 env->two_stage_indirect_lookup = false; 1769 #endif 1770 cs->exception_index = RISCV_EXCP_NONE; /* mark handled to qemu */ 1771 } 1772